Arthur simon



A. SIMON.

RESISTANCE UNIT.

APPLICATION men on. 9. m4.

1,303,404. Patented May 13, 1919.

UNITED STATES PATENT OFFICE.

ARTHUR SIMON, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER-HAMMER MFG. 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

RESISTANCE UNIT.

Specification of Letters Patent.

Patented May 13, 1919.

Application filed October 9, 1914. Serial No. 865,862.

To all 'tthO/it it may concern:

Be it known that I, ARTHUR SIMON, a citizen of the United States. residing at Milwaukee. in r the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Resistance'Units, of which the following is a full, clear, concise. and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relates to improvements in resistance units.

In practice resistance units are very commonly formed by winding resistance wire upon insulating bases of various kinds and while otherwise satisfactory much difiiculty has been experienced with units of thistype in the matter of terminals. The resistance Wire is ordinarily very fine, or in other words, of small cross section and soldered or otherwise connected to suitable terminal devices and much trouble has resulted from the corrosion of the wire at the points of connection with the terminals through electrolysis.

This invention has among .its objects to provide a unit which will-avoid the aforesaid difiiculties and which may be used for practically all purposes for which the aforesaid units are adapted.

A further object is to provide a resistance unit with terminals integral with the resistor.

A still further object is to provide a unit in which the resistor and terminals are integral and the terminals of a character to be received by ordinary fuse cli s for establishing circuit connections for t e unit.

The invention will now be more specifically described in connection with the accompanying drawing which shows certain embodiments thereof.

In the accompanying drawing Figure 1 shows one form of unit partly in section and partly in elevation and supports therefor; and,.

Fig. 2 shows in elevation a modified form of unit.

Referring to the unit shown in Fig. 1 the same comprises abase or support 1 of any preferred material having thereon a surface coating 2 of r sistance material constituting both the resistor and the terminals. In practice, any preferred material may be employed for coating the base land may be applied to said base in any preferred manner. Such a coatin may be readily applied to the readily varied by selection of metals, by

variation of the cross section of the metal deposit, and, as will also be apparent, by variation of the distance which the current is forced to traverse the resistance. Moreover, the resistor and terminals w ll be of integral formation and the terminals may be readily formed of any desired surface area adapting the same for connection in circuit in various different ways.

As shown in Fig. 1 the unit is of cylindrical form and adapted for support in ordinary fuse clips 3 and 4. The fuse clips thus provide convenient means for connecting the unit to suitable conductors 5 and 6 and, as will be apparent. the area of contact between the unit and clips is of such magnitude that any ordinary corrosion from electrolysis will in no wise impair the electrical connection of the unit.

As above suggested, the resistance value of the unit may be increased by lengthening the path which the current is required to take through the resistance and this may be readily accomplished in various different ways as, for example, that exemplified in Fig. 2. This figure also shows a unit comprising a base 1 and a surface coating 2 of resistance material and in this instance the coating 2 is divided into a series of convolutions 2*. In other words, the resistance is in the form of a stripextending spirally around the base 1 and when the aforesaid process is employed this formation of the coating may be readily obtained by coiling about the base a suitable cord or wire 7 to'protect a spiral strip thereof from the metal spray and then removing said cord or wire after completion of the spraying.

units consisting in first covering a portion of the surface of a suitable non-conductive body with a protective medium, second subjecting said body and medium to'the impact of finely divided conductive particles to cause the same to penetrate the surface of said body for mechanical anchorage, and third removing said protective medium.

2. The method of constructing resistance units consisting in first applying a protective medium to a helical section of the exterior surface of a substantially cylindrical non-conductive body, second subjecting the exposed surface of said body and protective medium to the impact of comminuted'electrically conductive particles causing the same to penetrate the exposed surface of said body and form. a resistlve coating thereon,

and third removing said protective medium to expose the llIlCOBJtGd portion of said surface.

3. A resistance unit comprising a, cylin- 'ticles thereof enetra ting the surface of said body for mec anical anchorage. In witness whereof, I have hereunto subscribed my name in the presence of two Witnesses.

ARTHUR SIMON. Witnesses .THELA BART, r L. A. WATSON. 

